Screw Air Compressor Manufacturer in India

Screw Air Compressor Models and Capacities

These are the free air delivery (FAD) figures for every single-stage Colt screw air compressor, taken from our current brochure. FAD is measured to ISO 1217 Annex C (Edition 3). All models run on 3 phase, 400 V, 50 Hz. CS 10 and CS 15 fixed-speed units are belt driven; the rest are direct drive. VFD models use an IE4 permanent magnet motor; fixed-speed models use an IE3 motor.

Air receiver we recommend: 500 litres up to 30 HP, 1,000 litres from 40 to 100 HP, and 2,000 litres for 120 HP and above. Noise figures are ±3 dB(A).

Models above 180 HP, up to 350 HP, are also available; ask us for their data sheets.

Not sure which size you need? Read our fixed speed vs VFD guide or send us your air demand and our engineers will size it for you.

Which screw air compressor size do you need?

Four questions decide the model. If you can answer them, we can quote the right machine the same day.

1. How much air, in CFM? Add up the rated consumption of every machine and tool that runs at the same time, then add about 20% for leaks and future load. A rule of thumb for a single-stage Colt screw is 4.2 to 5 CFM per HP at 8 bar.
2. At what pressure? 8 bar covers most plants. Choose 10 or 13 bar if your machines need it (every CS model is available at all three), and 16 bar VFD units for fibre laser cutting.
3. Is demand steady or does it swing? Steady demand near full output: fixed speed. Demand that changes through the day or between shifts: VFD, which cuts energy use by up to 35% on the same job.
4. What goes with it? An air receiver (500 L up to 30 HP, 1,000 L from 40 to 100 HP, 2,000 L from 120 HP), a refrigerated air dryer and line filters, and piping sized for the flow.

5-year cost comparison, fixed speed vs VFD, from the Colt screw compressor brochure.

Above 30 HP on round-the-clock duty, compare the two-stage CS2 series: it delivers 15 to 20% more air per HP than a single-stage machine of the same rating.

Where Colt screw air compressors are used

Our screw compressors run in more than 3,000 plants across India. The most common applications:

• Auto components, engineering and fabrication: pneumatic tools, CNC machines, paint shops and shot blasting on 8 to 10 bar.
• Textiles and spinning: air-jet looms and compact spinning, where VFD units follow the loom load.
• PET bottle blowing: a screw compressor supplies the 7 to 10 bar service air, and our oil-free PET bottling compressors supply the 40 bar blowing air.
• Pharma, food and packaging: with a refrigerated dryer and filters for dry, virtually oil-free air.
• Laser cutting: 16 bar VFD screw compressors from 15 to 60 HP, with air treatment for a clean cutting gas.
• Cement, steel, plastics, rice mills, cold storage and CBG plants: instrument and process air, usually on fixed-speed units with a large receiver.

Related reading: how to calculate screw compressor running cost · VFD screw compressors: sizing and running cost · screw compressors for laser cutting · fixed speed vs VFD · screw vs reciprocating · air receiver sizing · CFM, SCMH and other compressor terms

Screw air compressor FAQs

What sizes of screw air compressor does Colt make?

Single-stage CS series from 10 to 350 HP, fixed speed and VFD (the brochure table covers 10 to 180 HP, 42 to 832 CFM at 8 bar), and two-stage CS2 series from 30 to 200 HP (156 to 1,281 CFM at 8 bar). Standard working pressures are 8, 10 and 13 bar; 16 bar VFD versions from 15 to 60 HP are built for laser cutting.

How many CFM does a screw air compressor give per HP?

From our brochure figures, a single-stage Colt screw compressor delivers roughly 4.2 to 5 CFM per HP at 8 bar (for example CS 40 FS: 198 CFM, CS 100 FS: 477 CFM). A two-stage model delivers about 5.2 to 6.4 CFM per HP at 8 bar, which is why two-stage pays off above 30 HP on continuous duty.

Fixed speed or VFD: which one should I buy?

Choose fixed speed if your plant draws air steadily, close to the compressor's full output, through the shift. Choose VFD if demand rises and falls during the day or between shifts: the motor slows to match demand, and the brochure figure for energy saving is up to 35% against a fixed-speed unit on the same job. VFD models also start softly, so there is no inrush current.

What size of air receiver should go with the compressor?

Our standard recommendation is 500 litres up to 30 HP, 1,000 litres from 40 to 100 HP and 2,000 litres for 120 HP and above. The receiver smooths pressure, gives the dryer time to work and reduces load/unload cycling.

Are Colt screw air compressors oil-free?

No. They are oil-injected rotary screw compressors with a high-efficiency oil separator. With a Colt refrigerated air dryer and line filters the air is virtually oil-free and suitable for most plants. If you need ISO 8573-1 Class 0 air, for PET bottle blowing or pharma, use our oil-free reciprocating or oil-free booster compressors instead.

Where are the compressors made, and who services them?

Every Colt screw air compressor is built and tested at our ISO 9001:2015 plant in Sonipat, Haryana. Our own engineers install and commission the machine, and we offer annual maintenance contracts, genuine spares and breakdown support across India.

How much does a screw air compressor cost?

Price depends on the HP, the working pressure, fixed speed or VFD, and what is packaged with it (receiver, dryer, filters). Send us your air demand in CFM and the pressure you need, and we will quote the right model within a working day.

GET A QUOTE FOR YOUR AIR DEMAND

Model data from the Colt screw air compressor brochure. Last updated: 15 October 2026.